Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Methylmaleic Acid

The best laboratory synthesis of thymine (947) is probably from 3-methylmalic acid (945) which gives 2-formylpropionic acid (946 R = H) in situ by decarboxylation and oxidation in fuming sulfuric acid prior to condensation with urea (46JA912) a similar method from ethyl 2-formylpropionate (946 R = Et) is also described (68IZV918). [Pg.143]

Compound C6HsN3°3 mw 167.12, N 25.15% was obtd by Quilico Fusco (Ref 2) as a white flocculent ppt, on treating the basic compd of probable formula O.N C(CH3).CH C.NH.CO.-CH2.NH2 with Na nitrite in AcOH. The basic compd was one the products obtained by Q F during investigation of reactions betw citraconic (methylmaleic) acid and nitric acid. The dried compd C6HsN303 exploded violently on heating. It is sol in cold aq alkalias alk carbonates and is decompd by hot alkalies mineral acids with the evoln of gas... [Pg.273]

Methylmalic acid) (aliphatic dicarboxylic acid) Citrus spp. (Rutaceae) [fruit] ... [Pg.415]

Creosol was not very reactive. At pH 8, according to Nimz and Schwind [78], over 70% of nnreacted creosol was recovered after treatment for one honr at 60°C. However, McDonongh and Rapson [88] reported that malonic and methylmaleic acids were fonnd when creosol was treated with peracetic acid at pH 9. They snggested that nncleophilic attack by peracetate anions occnrred at the ring carbon, C6. Bnt this mechanism is donbtfnl since hydroperoxide anion, a stronger nncleophile than peracetate [15], does not react with creosol. [Pg.457]

E.51) (E.51) 2-Butenedioic acid, 2-methyl-, (Z)-, (Z)-2-methylbut-2-enedioic acid, citraconic acid, methylmaleic acid [498-23-7]... [Pg.164]

Citraconic Acid. 2-Methyi-2-butenedioic acid methylmaleic acid. C H604 mol wt 130.10. C 46.16%, H 4-65%, O 49.19%. Obtained by carefully heating citric acid at about 175. Production o( citraconic anhydride from ita -conic acid Humphrey. U.S. pat. 2.966,498 (i960 to Pfizer). [Pg.362]

Citramalic Acid. 2-Hydroxy-2-methylbutanedioic acid 2-methylmalic acid 2-hydroxy-2-methylsuccinic acid a-hydroxypyrotartaric acid trnns-methylbutanedioic add. CjHjO., mol wt 148.11. C 40.54%. H 5.44%. O 54.01%. Enzymatic synthesis Barker. Blair, Biochem. Prepns, 9, 21 (1962). Chemical synthesis Barker, ibid. 25 J. B. Wilkes, R. G. Wall. J. Org. Chem. 45, 247 (1980). Stereoselective synthesis E. G. J. Staring el al. ReC. Trav. Chim. 105, 374 (1986). [Pg.362]

The rate of reaction decreases with increase in the number of substituents on the doubly bonded atoms. However, not all substituents have the same influence. Terminal double bonds react faster than those in the interior of a chain 112 and with further increase in the number of substituents on the double bond there may be no reduction at all. Relative rates of reaction measured by Hiinig et al.106 are maleic acid 10, methylmaleic acid 0.7, dimethyl-maleic acid 0, and ethylenetetracarboxylic acid (dicarboxymaleic acid 0.3). Nevertheless, under other conditions dimethylmaleic acid also can be reduced.109... [Pg.16]

Methyl-l,2 hexadiene 2-Methylhexane Methyl hexyl ketone Methvj-m-hydroxybenzoate Methyl p-hydroxybenzoate Methyl iodide Methylmaleic acid 9-Methyl-lO methoxyanthracene Methyl-o-methoxybenzoate Methyl-p- methoxybenzoate Methyl-a-methoxy isobutyratc... [Pg.472]

Methylmaleic acid to methyl fumaric acid Dimethylmaleic ester to dimethylfumaric ester Vinyl allyl ether to allylacetaldehyde Cyclopropane to propylene... [Pg.152]

Ethyl-4-( 1 -methylene-3-phenylpropyl) benzene, see E-30159 2-Ethyl-3-methylfumaric acid, in E-20128 2-Ethyl-3-methylmaleic acid, in E-20128... [Pg.455]

Ethyl 2-furoate, in F-10028 2-Ethyl-3-methylmaleic acid Anhydride, in... [Pg.518]

Methyl isopulegene, A39 O-methyllactic acid, Al i3-methylmalic acid, YS Methylmalonyl coenzyme-A, A28... [Pg.307]

In the skins of apples, pyruvic acid is the precursor of (+)-L-citramalic acid, which is also known as (S)-2-hydroxy-2-methylsuccinic acid or (S)-2-methylmalic acid (8-66). During fruit ripening, citramalic acid is oxidised to 2-oxobutyric acid and its decarboxylation yields acetone, which is a component of apple odour. The same isomer of citramalic acid is produced by some enterobacteria as a degradation product of glutamic acid to pyruvic acid. The (J )-isomer of citramalic acid is an intermediate in the biosynthesis of isoleucine in spirochetes. [Pg.561]


See other pages where Methylmaleic Acid is mentioned: [Pg.100]    [Pg.218]    [Pg.107]    [Pg.106]    [Pg.613]    [Pg.167]    [Pg.107]    [Pg.117]    [Pg.688]    [Pg.257]    [Pg.137]    [Pg.13]    [Pg.561]    [Pg.522]    [Pg.92]    [Pg.472]    [Pg.303]    [Pg.757]    [Pg.757]    [Pg.757]    [Pg.183]    [Pg.558]    [Pg.303]    [Pg.185]   


SEARCH



Citraconate 2-methylmalic acid

Methylmalic acid

Methylmalic acid

© 2024 chempedia.info